Sofa



FIG. 1 is a front view of the design,

FIG. 2 is a rear, right side perspective view of the design, and therear, left side perspective view is a mirror image.

FIG. 3 is a front, right side perspective of the design, and the front,left side perspective view is a mirror image.

FIG. 4 is a right side view of the design, and the left side view is amirror image; and,

FIG. 5 is a top plan view of the design.

The ornamental design for a sofa, as shown and described. 